Implement average rating and count of ratings

* RESOLVE michael-cannon/testimonials-widget#108 Search results: average rating and amount of reviews
Merge commit '53e43461dfdf485a9765cfa96fb2beefc0fa1c07' into 3.0.0RC1
Merge commit '05bf28b01c318398e8deb052db1ecfb87196f943' into 3.0.0RC1
Merge commit '7325892a4e8f16a6f3cf5f6c222e034046338682' into 2.0.0RC1
Merge commit 'f5aff2dda37645433cf92791eb72b8db8195025f' into 2.0.0RC1
Merge commit '2489baab86cbb6d8761c640367a4033ee4398514' into 2.0.0RC1
Moved author field to Aihrus Testimonials

* RESOLVE michael-cannon/testimonials-widget#23 Reorganize meta data fields - Author to top
* Update OPTIONS
Merge commit '56bd2196118e2871c3ed6e340be8ae56ac6c85f5' into 2.0.0RC1